MCJIT: Tidy up the constructor.

The MCJIT doesn't need or want a TargetJITInfo. That's vestigal from the old
JIT, so just remove it.

rdar://12119347

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162280 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index a744d0c..4afc900 100644
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -501,7 +501,8 @@
     return 0;
   }
 
-  if ((WhichEngine & EngineKind::JIT) && ExecutionEngine::JITCtor == 0) {
+  if ((WhichEngine & EngineKind::JIT) && ExecutionEngine::JITCtor == 0 &&
+      ExecutionEngine::MCJITCtor == 0) {
     if (ErrorStr)
       *ErrorStr = "JIT has not been linked in.";
   }